Do you have leaky transmission lines? This is the last set of transmission lines you'll ever need. In a joint venture between Speed Stop Auto Repair and Masonbilt Diesel Performance, we have developed the most durable, serviceable, and the only DOT-approved transmission line set with a lifetime warranty.

All of these lines are made by hand, in-house, with equipment we own, meaning that we have complete control over quality and know that each line is being made to our exact specifications.

Features and Benefits:

• Auto Repair/Masonbilt Diesel Performance Duramax 5/8 Transmission Cooler Line Kit 11-14 GM
• 5/8 inch flame and abrasion-resistant hose rated for 4000psi - significantly more than both OEM and built transmissions require
• Stainless JIC ORB fittings - no aluminum to corrode or crack
• Our own specific line lengths and fittings tailored specifically to each truck
• Complete 3-piece replacement line set and all necessary fittings for the truck side, zip ties, and an extra O-ring
• Instructions included
• Lifetime warranty

Fitment Notes:

• Please see pictures if you have additional questions
• If you have an aftermarket radiator, you will need M22 fittings instead of OE-style to JIC. This can be easily determined if your radiator has a hex-shaped fitting behind the OE-style transmission cooler fittings
• 2001-2002 Allison transmission cooler inlet/outlet fittings had a smaller 3/4 inch thread diameter than later 7/8 inch units. If you think your transmission has been swapped with a later unit, you can measure the original trans cooler fitting in the transmission or reference the build plate found on the passenger-side of the transmission.

Details:

• Liter: 6.6 Liter
• Fuel Type: Diesel
• Engine Years: 2011-2014
• Engine Manufacturer: Duramax
• Engine Designation: LML
• Fitting Material: Stainless Steel
• Size: 5/8 Inch
• Color: Black
• PSI: 400 PSI
• Warranty: Lifetime Warranty